he had had a concealed weapons permit out of virginia for the past four years. >> police do not believe paul partis, the man who terrorized johns hopkins hospital, planned ahead of time, to shoot his elderly mother's doctor. >> no one has indicated to me any level of premeditation. again, back to our investigation. i don't know -- we don't know yet if it was in his daily routine, coming and visiting his mother, that he always had that gun. >> investigators say he was distraught over her prognosis. and used a tiny, 32-caliber cal tech semi automatic handgun, like this one, hitting dr. david cohen with a single shot to the stomach, before killing his mom and then himself. >> it's a very, very small weapon. the whole thing could be concealed in the palm of your hand. >> reporter: partis had a permit to carry a concealed weapon in virginia. but he had no criminal record. >> reporter: partis lived with his mother in this home in arlington, virginia. his brother said he'd make the driver to johns hopkins almost daily, where she was getting treatment to battle cancer. and he thought her health